public class test {
    //main
    public static void main(String[] args) {
        //sout
        System.out.println("hello world!");
        System.out.println("change world!!!");
        int goodsNum=54415;
        String goods_name="麻辣王子";
        String name="zoumuchu";
        char sex='男';
        String sex1="男生";
        double price=5.00;
        int num=3;
        double total=15.00;
        float num2=5.00f;
        byte a=10;
        byte b=(byte) num;
        System.out.println(a);
        System.out.println(b);
        byte c=127;
        System.out.println(c);
        c+=1;//溢出
        System.out.println(c);

    }
}
